| Date | Acquired | Amount |
|---|---|---|
| Apr 04, 2016 |
|
$ 500,000,000 |
| Aug 18, 2015 |
|
$ 1,800,000,000 |
| Nov 12, 2014 |
|
$ 2,500,000,000 |
| Sep 08, 2014 |
|
Undisclosed amount |
| Jul 31, 2012 |
|
Undisclosed amount |
| Dec 21, 2006 |
|
Undisclosed amount |
| Sep 06, 2000 |
|
$ 145,200,000 |
| Mar 08, 1999 |
|
Undisclosed amount |
